But sometimes our failures have been monumental — and uncorrected.
Perhaps the best, or worst, example, is the complete destruction of the Aral Sea. Once one of the four largest lakes in the world by surface area, fed by the Amu Darya and Syr Darya rivers, it has now been destroyed by the complete diversion of inflows to grow crops — largely cotton — in the arid regions of Uzbekistan (with parts of the watershed of the Sea in Tajikistan, Turkmenistan, Kyrgyzstan and Kazakhstan).
All 24 species of fish endemic to the Aral Sea are now extinct. Dust storms spread respiratory diseases. And the local climate has been altered.
Here is an animated gif showing the disappearance of the sea between 2000 and just last month: August 2014 (data/satellite images courtesy of NASA).
The Aral Sea from 2000 to 2014.
And here is a picture of the Sea in 1977, in its former glory.
The Aral Sea in 1977.
This should be a lesson to all of us. I hope it will be, but in the United States we are heading for the destruction of the Salton Sea, with similar consequences. We are drying up more and more of our rivers before they reach the ocean. And we see even the Great Lakes suffering from water quality contamination and massive algal blooms, potentially worsened by climate change.
Aral Sea: RIP